<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style>
@import url("nonexist.css");
@font-face { font-family: myFont; src: url("nonexist.woff"); }
p { background-image: url("nonexist.bmp"); }
</style>
<link rel="shortcut icon" href="nonexist.bmp">
<link rel="stylesheet" href="nonexist.css">
<script src="nonexist.js"></script>
</head>
<body>
<img src="nonexist.bmp">

<img srcset="nonexist.bmp 1x, nonexist.bmp 2x">

<iframe src="nonexist.html"></iframe>
</body>
</html>
